Drawing-board



(No Model.)

S. W. GOODWIN.

DRAWING BOARD. No. 316,538. Patented Apr. 28, 1885.

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SETI-I W. GOODVIN, OF TOLEDO, OIIIO.

DRAWING-BOARD.

SPECIPCATION forming part of Letters Patent No. 316,538, dated April 28, 1885.

Application tiled June 18, 1854.

To all wwm it may concern:

Be it known that I, SETH W. GOODWIN, a

citizen of the United States, residing at Toledo, in the county of Lucas and State of Ohio, have invented a new and useful Improvement in Drawing-Boards, of which the following is a specication. 4 My invention relates to improvements in drawing-board mechanism with which rules are used for drawing true and parallel lines in making mechanical and other drawings.

The nature of my invention consists in placing, in combination with a drawing-board, a rule which is` connected by suitable mechanism, hereinafter described, the object of which is to keep the rule at all times in true parallelism. I attain this object by mechanism illustrated inthe accompanying drawings, in which- Y Figure l is a plan of the entire mechanism. Fig. 2 is a vertical section on line .10, Fig. 1. Fig. 3 is an end view on line x, Fig. l. Figs.

' 4, 5, 6 and 7 are detached and enlarged views of the wheels and wires by which the rule B is operated. Fig. 8 is a sectional view of one of the side-bars, O, cut on line Y, Figs. l and l0, except the rule B, which is cut on line V, Fig. 10. Fig. 9 is a sectional view of a metallic clasp, the office of which is to connect the rule B with the frame G, which holds the board and its connections. This view is cnt on line 5v, Fig. 8. Fig. 10 is a sectional view of the rule B and its fastening-bolt D on line z, Fig. 8. Fig. ll is a full-size side view of the bolt D.

The frame O is made ina rectangular form, the ends being made of two pieces of material, as shown at O and C, Fig. 8, the under one extending inward, forming a ledge, as shown in this gure, and as shown by the dotted lines E E, for supporting in working position the drawing-board A. This board is made inthe ordinary manner, and several such boards can each in turn be used with the frame O and its connections. In connection with this mechanism is a rule, B, which extends over the ends of the frame C, as shown in Fig. l. One ob ject of this extra length is to enable the said rule B to swing around for drawing diagonal lines, as shown by the dotted position F F; and another object of the said extension is to connect the rule B with the sliding clamps G, hereinafter explained.

(Xo model.)

On either end of the fra-me O is a sliding metallic clamp, (shown at G in the several top and down upon the edge ofthe frame and through the groove H in such a manner and being of such a form as to be tirmly locked to the said frame O in every direction, except longitudinally to the end ofthe frame C, which way it slides freely.

Connecting the clamps G and the rule B are the bolts d. (Shown in the several views. and also detached in Fig. Il.) This bolt has a rectangularshaped head, and said head slides tightly in the slot I in either endl of the rule B. The body part of the bolt D is made round and split, as shown in Fig. ll, in order that it may be slightly expanded toll and fit tightly' in the hole in the clamp G, thus completing the connection of the r-ule B with the frame C, in a very efficient and perfect manner, and enabling the said rule to be set at different angular positions, as illustrated in Fig. l.

The principal part of my invention is the mechanism hereinafter shown for maintaining the parallelism of the rule B. This motion is clearly traceable by reference to the several Figs. 4, 5, 6, and 7.

In Fig. 6 is shown a continuous metallic or other belt or cord, L, passing over a series of pulleys, one each at J J, and two each. at K K. Between J and K the belt passes and the pulleys are arranged as shown in Figs. 4 and 5, and between K K the belt crosses and the pulleys are arranged as shown in Fig. 7. The motion of the belt L is traceable in all these gures (Figs. 4, 5, 6, and 7) by ref erence to the arrows and by following the order of the numerals l, 2, 3, 4, 5, and 6. In Fig. 1 these pulleys J and K and the belt L are shown in dotted lines, and are provided with suitable taking-up screws for maintaining the tension of belt L.

By again referring to Fig. 6 it will be seen that the belt L, at the position shown by arrows l and 4, moves in the same direction, and when reversed both parts move in an opposite direction, as shown by arrows 3 and 4. It is therefore apparent that if the two ends of the rule B are attached to this belt at the points M lVI, andthe said rule moved over the face of the board A, the parallelism of the views,) portions of which clamp pass over the V IDO true regardless of Kthe angle-at Ywhich the said rule is fastened to the said belt, as shown by F and N in Fig. l.

To accomplish the changing of the position of the rule B, as shown in Fig. 1 at F N, I have provided a ready means of fastening thfe metallic clamp G at any desired point to the belt L, and for quickly releasing the same, as follows:

In Fig. 9 the belt L is quickly fastened-to f or released from the clamp G by turning Y the screw l?, whichscrew actuates the springV O rule will be maintained, and the same will be bination with the rule B, for producing a parallel-motion, substantially as shown; and described.

2. In a drawing-board mechanism, the rule B and slotted bar G, in combination with the clasp G and its locking and releasing device, consisting ofthe screw l? and spring O, substantially as shown and described.

3. In a drawing-board mechanism, the rule B, having the T-slot I in one or both of its ends, in combination with the bolts D and mechanism, substantially as described, for givinga parallel movement to the rule B.

SETH W, GOODWIN.

Witnesses:

WM. JoHNs, Jr., C. LScor'r.` 

